JP2001158883A - Dry method for quenching coke and quenching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry method for quenching coke causing no clinker deposit in ventilating a prechamber to improve safety by burning of combustible gas and coke breeze and in improving waste heat recovery and to provide fire extinguishing devices. SOLUTION: This dry method for quenching coke comprises having a quenching tower 1 comprising a cooling chamber 2 and a prechamber 3 set at its upper part, introducing red-hot coke 9 from upper side, heat-exchanging sensible heat of the red-hot coke with a medium of an inert gas in a cooling chamber and heat-recovering as steam and is characterized by blowing an air 24 and a water or steam 26 at the same time. One or both of a blowing amount of the air 24 and that of the water or steam 26 is adjusted to keep a temperature in the prechamber 2 to be <=1150 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coke dry extinguishing method and a fire extinguishing apparatus.

[0002]

2. Description of the Related Art In cooling red-hot coke discharged from a coke oven, a coke dry-type fire extinguisher (so-called CDQ (Coke Dry Quencher)) is used to recover sensible heat of the red-hot coke to save energy.

The dry fire extinguisher has a cooling chamber for exchanging the sensible heat of the red hot coke into an inert gas, and a pre-chamber above the cooling chamber. Red hot coke is charged into the pre-chamber from above the pre-chamber. The pre-chamber is provided for the purpose of absorbing the time fluctuation of the input of the red hot coke and obtaining the stability of the operation. 950
Coke charged at 1100 ° C. is heat-exchanged with an inert gas in a cooling chamber, cooled to about 200 ° C., and then cut out in fixed amounts. After the heat exchange, the inert gas heated to 900 ° C. is discharged from the upper part of the cooling chamber to the ring duct and
Next, heat is recovered by a waste heat boiler through a dust catcher, and is again pumped to a cooling chamber by a circulation blower.

[0004] The coke charged contains volatiles and fine coke. Volatile components are highly flammable and may be abnormally burned if contained in a high proportion in the circulating gas. Therefore, when air is blown into the pre-chamber, volatile matter and fine coke remaining in the coke mass can be burned. The blown air may burn part of the surface layer of red hot coke. As a result, the amount of heat of the gas discharged from the cooling chamber can be increased by mixing the hot air and the combustion exhaust gas with the inert gas.
Further, since the temperature of coke reaching the cooling chamber via the pre-chamber is also increasing, the amount of heat recovered by the inert gas in the cooling chamber also increases. As a result, the amount of recovered steam in the waste heat boiler can be increased.

[0005] By blowing air into the pre-chamber, the amount of heat recovery in the waste heat boiler can be increased in the steady-state operation of the dry fire extinguishing system, and
Even if the coke temperature in the cooling room decreases due to a decrease in the supply amount of red hot coke or a decrease in the temperature of the charged red hot coke, the amount of heat recovery in the waste heat boiler can be maintained constant. Will be possible. JP-A-61-3
No. 7893 discloses a method of blowing air into a pre-chamber.

[0006]

By blowing air into the pre-chamber and burning part of the remaining volatile matter, fine coke and lump coke, both the blown air and the coke in the pre-chamber are charged with red hot coke. The temperature rises above the temperature. When the temperature in the pre-chamber becomes 1200 ° C. or higher, the ash contained in the coke is melted and vaporized, and the vaporized ash is carried along with the air. The temperature of the inert gas introduced into the cooling chamber is 900 ° C
Before and after, the ash vaporized in the pre-chamber aggregates and adheres to the sloping flue at the top of the cooling chamber.
This deposit is called clinker, and has a problem that it blocks the gas ventilation holes, increases gas flow resistance, and inhibits circulation of the high-temperature coke cooling gas.

The present invention is intended to improve the safety by injecting air into the pre-chamber and combustible gas and coke breeze, etc., and to increase the amount of waste heat recovered. It is an object of the present invention to provide a coke dry-extinguishing method and a fire extinguishing apparatus that stabilize the temperature of gas supplied to a boiler in addition to preventing the occurrence of adhesion of water.

[0008]

That is, the gist of the present invention is as follows. (1) A fire extinguisher tower 1 comprising a cooling chamber 2 and a pre-chamber 3 above the cooling chamber 2 is provided, and a red hot coke 9 is mounted from above. Enter
In a coke dry quenching method in which the sensible heat of the red hot coke is heat-exchanged in a cooling chamber using an inert gas as a medium and heat is recovered in the form of steam, air 24 is introduced into the pre-chamber from above the pre-chamber 2. A coke dry fire extinguishing method characterized by blowing water or steam 26 at the same time as blowing. (2) One or both of the blowing amount of the water or steam 26 and the blowing amount of the pre-chamber blowing air 24 are adjusted so that the temperature in the pre-chamber 2 becomes equal to or higher than the temperature of the input red hot coke and equal to or lower than a predetermined temperature. The coke dry extinguishing method according to the above (1). (3) The coke dry extinguishing method according to the above (2), wherein the predetermined temperature is 1150 ° C. (4) The air (25) is supplied to the high-temperature exhaust gas 22 discharged from the fire extinguishing tower 1 before reaching the waste heat boiler 7, and the components in the exhaust gas 22 are burned. The coke dry extinguishing method according to any one of (1) to (3). (5) A low-temperature inert gas is supplied to the high-temperature exhaust gas 22 discharged from the fire extinguishing tower 1 before reaching the waste heat boiler 7, and the temperature of the waste heat boiler supply gas 23 is reduced or reduced to a predetermined temperature. The coke dry extinguishing method according to any one of the above (1) to (4), wherein the method is adjusted to a range. (6) The dry coke extinguishing method according to the above (5), wherein the low-temperature inert gas is a gas 29 obtained by branching a part of the inert gas supplied to the cooling chamber. (7) Adjusting the amount of water or steam 26 added to the pre-chamber blowing air 24 and / or the pre-chamber is performed by changing the high-temperature gas discharged from the cooling chamber and the pre-chamber to a low-temperature gas before reaching the waste heat boiler. The coke dry extinguishing method according to the above (5) or (6), wherein the temperature of the boiler supply gas 23 is adjusted to a target temperature range by using together with the adjustment of the amount of the inert gas. (8) Water or steam 26 blown into the pre-chamber
Is an air blowing device 14 for blowing into the pre-chamber.
The coke dry fire extinguishing method according to any one of the above (1) to (7), wherein the coke is blown together with the nozzle. (9) The coke dry-extinguishing method according to any one of (1) to (8), wherein the water is blown into the pre-chamber in a mist state. (10) The fire extinguisher tower 1 including the cooling chamber 2 and the pre-chamber 3 above the cooling tower 2. The red-hot coke 9 is charged from above, and the sensible heat of the red-hot coke 9 is used in the cooling chamber as an inert gas medium. In a coke dry extinguishing method in which heat is exchanged and heat is recovered in the form of steam, air 24 is blown into the pre-chamber from the upper part of the pre-chamber so that the temperature of the pre-chamber becomes 1150 ° C or lower. A coke dry fire extinguishing method characterized by adjusting the amount of air blown into the chamber.

(11) A cooling chamber 2 for exchanging the sensible heat of the red hot coke into an inert gas, and a pre-chamber 3 above the cooling chamber 2
In a coke dry fire extinguishing system having a fire extinguisher 1 comprising a fire extinguisher 1 and a waste heat boiler 7 for recovering heat of an inert gas in the form of steam, the upper part of the prechamber 3 is blown by blowing air 24 into the prechamber. A coke dry-type fire extinguisher characterized by comprising a device 14 and a blowing device 16 for blowing water or steam 26. (12) It is necessary to have a blowing control device 17 for adjusting one or both of the blowing amount of the water or steam 26 and the blowing amount of the pre-chamber blowing air 24 so that the temperature in the pre-chamber 3 becomes 1150 ° C. or less. The coke dry-type fire extinguisher according to (11), which is characterized in that: (13) The high-temperature gas discharge path from the fire extinguisher 1 to the waste heat boiler 7 includes an air blowing device 15 for supplying air for burning components in the exhaust gas 22 (11). ) Or the coke dry fire extinguisher according to (12). (14) In the high-temperature gas discharge path from the fire extinguisher 1 to the waste heat boiler 7, the temperature of the waste heat boiler supply gas 23 is
The coke dry fire extinguisher according to any one of (11) to (13), further including an inert gas supply device that supplies a low-temperature inert gas 29 for decreasing or adjusting the temperature to a predetermined temperature range. . (15) The coke dry fire extinguisher according to (14), wherein the low-temperature inert gas supply device is a device 19 that branches and supplies a part of the inert gas to be supplied to the cooling chamber. . (16) The amount of water or steam 26 added to the pre-chamber blowing air 24 and / or the pre-chamber, and the low-temperature inert gas between the high-temperature gas discharged from the cooling chamber and the pre-chamber to the waste heat boiler. (1) an operation device for adjusting the temperature of the boiler supply gas 23 to a target temperature range by providing a device for adjusting the amount of boiler.
4) or the dry coke fire extinguisher according to (15). (17) The nozzle of the blowing device 14 for blowing air into the pre-chamber also serves as a nozzle for blowing water or steam.
A dry coke fire extinguisher according to any one of the above. (18) The coke dry fire extinguisher according to any of (11) to (17), wherein the blowing device that blows water into the pre-chamber blows water in a mist state. (19) The cooling tower 2 including the cooling chamber 2 for exchanging the sensible heat of the red hot coke 9 to the inert gas and the pre-chamber 3 above the cooling chamber, and the heat of the inert gas is recovered in the form of steam. In the coke dry fire extinguishing apparatus having the waste heat boiler 7, a blowing device 14 for blowing air into the pre-chamber is provided above the pre-chamber 3 so that the temperature in the pre-chamber is 1150 ° C or lower. A coke dry-type fire extinguisher characterized by having a blowing control device 17 for adjusting a blowing amount of the pre-chamber blowing air 24. (20) The temperature in the pre-chamber is measured by using a temperature measuring device 18 that measures the ambient temperature or coke temperature of the lower portion of the inner brick by a thermometer or a radiation thermometer inserted from the outside. (12) to (1)
The coke dry-type fire extinguisher according to any one of 9). It is in.

The present invention is characterized by blowing water or steam 26 together with air 24 into the pre-chamber. Water gas reaction when red hot coke and steam come into contact,
It is an endothermic reaction with the generation of hydrogen gas and carbon monoxide. When water is blown, an endothermic reaction when water evaporates is added to the endothermic reaction by the water gas reaction. Therefore, the temperature in the pre-chamber becomes equal to or higher than the input red hot coke temperature by blowing air into the pre-chamber. On the other hand, by blowing water or steam into the pre-chamber, an endothermic reaction occurs, and as a result, the temperature in the pre-chamber can be maintained at a certain temperature or lower.

As a result, it is possible to prevent the ash from melting and vaporizing in the pre-chamber, and to prevent the clinker from adhering to the gas circulation system.

Part of the hydrogen and carbon monoxide generated by the water gas reaction are immediately burned by the air blown into the pre-chamber, while the rest is discharged from the cooling chamber 2 to the ring duct 5 together with the inert gas 27. You. Air 25 is blown into the gas exhaust pipe 12 sent to the ring duct 5 or the boiler, and hydrogen and carbon monoxide are burned in the ring duct or the gas exhaust pipe to generate heat, and finally as steam in the waste heat boiler 7. Heat is recovered. Therefore,
Although the temperature inside the pre-chamber is reduced by the water gas reaction, the amount of heat finally recovered is rather increased.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

The fire extinguishing tower 1 for cooling red hot coke is formed in a vertical shape, and has a pre-chamber 3 and a cooling chamber 2 in a vertical direction. The pre-chamber 3 and the cooling chamber 2 are divided as a gas flow by a sloping flue portion 4 formed around the inner wall.

Red hot coke 9 having a temperature of about 980 ° C. is charged from above the pre-chamber 3 and moves gradually downward, and in the cooling chamber 2, a blowing pipe 11 at the lower part of the cooling chamber.
Is cooled by the inert gas 27 blown from the air.
The temperature of the coke 10 when discharged from the lower part of the cooling chamber is around 210 ° C.

The inert gas 27 blown in the cooling chamber exchanges heat with the red hot coke while rising in the cooling chamber, the gas temperature rises, and the ring duct 4 from the sloping flue section 4 in the upper part of the cooling chamber. It is discharged to 5. Further, the inert gas is sent from the ring duct 5 through the primary dust catcher 6 to the waste heat boiler 7, where the heat is recovered by the waste heat boiler 7 and the temperature is reduced to about 180 ° C., and then cooled again through the circulation blower 8. It is blown into room 2.

Air blowing device 1 above prechamber
From 4, air 24 is blown into the pre-chamber. The oxygen in the blown air reacts with the remaining volatiles, fine coke and part of the lump coke. The reaction is an exothermic reaction that mainly produces carbon monoxide, and the blown air, product gas, and coke descend in the pre-chamber while increasing in temperature, and reach the highest temperature in the lower part of the pre-chamber.

The blown air and generated gas are mixed with an inert gas rising from below at the lower part of the pre-chamber, and are discharged from the sloping flue section 4 to the ring duct 5. Air 25 is blown into the ring duct 5 or the gas discharge pipe 12 from the air blow pipe 15 to burn carbon monoxide generated in the pre-chamber to form carbon dioxide.

Further, in the present invention, water or steam 26 is blown into the pre-chamber from above the pre-chamber by the water or steam blowing device 16. The injected water absorbs heat when it evaporates into steam, and the steam comes into contact with red hot coke to generate hydrogen gas and carbon monoxide by a water gas reaction and absorb heat. Therefore, the temperature of the gas and coke in the pre-chamber is reduced by blowing water or steam, and the temperature of the gas and coke in the pre-chamber can be adjusted by adjusting the amount of water or steam blown.

The hydrogen gas and carbon monoxide generated by the water gas reaction descend in the pre-chamber, mix with the inert gas rising in the lower part of the pre-chamber, and are discharged from the sloping flue section 4 to the ring duct 5. Air 25 is contained in the ring duct 5 or the gas exhaust pipe 12.
Is blown, and hydrogen gas and carbon monoxide are burned to produce water and carbon dioxide. At the same time, the calorific value of the waste heat boiler supply gas 23 increases due to the combustion heat of the combustion.

As a result of blowing water or steam into the pre-chamber, the amount of heat supplied by the waste heat boiler supply gas 23 on the boiler inlet side increases as described above. Therefore, in the case of the present invention that blows water or steam,
It is also possible to reduce the amount of air blown into the pre-chamber while securing the required amount of heat in the waste heat boiler. That is, by controlling one or both of the amount of air blown into the pre-chamber and the amount of water or steam blown into the pre-chamber, the maximum temperature inside the pre-chamber and the gas amount and gas temperature of the waste heat boiler supply gas 23 are controlled. At the same time, it is possible to adjust to optimal conditions.

In the case where the amount of heat obtained by the inert gas by cooling the red-hot coke is high and the amount of heat supplied to the waste heat boiler can be sufficiently secured, the pre-chamber can be supplied without supplying water or steam from the pre-chamber. The temperature in the pre-chamber can be reduced only by reducing the blowing amount of the blowing air 24.

The method for measuring the temperature inside the pre-chamber includes a method of measuring the ambient temperature or coke temperature near the inside of the inner cylinder brick by inserting a thermometer from the outside into the pre-chamber part through a wall (18a), There are a method of measuring the temperature of the inner cylinder brick or the ambient temperature with a thermometer inserted into the brick (18b), and a method of measuring the temperature near the lower part of the inner cylinder brick with a thermocouple or a non-contact thermometer (18c). The temperature near the lower part of the inner cylinder brick was represented. It is preferable to measure the ambient temperature or coke temperature at the lower part of the inner cylinder brick with a thermometer with a protective tube inserted from the outside or the brick or coke temperature with a radiation thermometer. The measured temperature in the pre-chamber is sent to a blowing control device 17 (not shown), and the blowing control device 17 controls the blowing amount of the water, steam 16 or air 24 so that the temperature in the pre-chamber reaches the target temperature.

Ash in coke powder has conventionally been considered to melt at 1400 ° C. or higher, but as a result of many tests, it was found that it softened and melted at about 1200 ° C. The temperature in the pre-chamber is preferably a temperature at which Ash in the coke powder does not melt. In particular, in the case of a multi-component system, the softening temperature tends to decrease. In consideration of the temperature variation in the cross section of the pre-chamber having a radius of about 10 m, specifically, the temperature in the pre-chamber is set to 1150 ° C. or less in operation. It has been found that it can be a major particularly preferred criterion. It is effective to control the temperature at a lower temperature in consideration of safety from the viewpoint of long-term stable operation.

Air 24 blown from the upper part of the pre-chamber
It is preferable that water or steam 26 is blown into the upper part 30 of the red hot coke layer in the pre-chamber or into the space 31 formed by the surface of the red hot coke layer and the pre-chamber. When air and water or steam are blown into the red hot coke layer 32, the reaction proceeds only in the coke in the vicinity of the blown gas, the distribution of the gas becomes uneven, and the temperature distribution in the cross section of the pre-chamber,
This is because the reactivity varies.

The nozzle of the air blowing device 14 and the nozzle of the water or steam blowing device 16 can be provided separately. However, water or steam is mixed into the air blowing nozzle, and the mixed gas is supplied to the pre-chamber. 3 may be blown. In addition, it is particularly preferable that the water is blown in a mist form.

Air 24 blown from the upper part of the pre-chamber
Is for the purpose of raising the temperature inside the pre-chamber,
It also has the purpose of burning volatile matter and fine coke contained in coke to be charged. Therefore, even if the operating condition of the dry-type fire extinguisher is an operating condition in which sufficient waste heat recovery is performed without air blowing, it is necessary to always continue air blowing. When charging red hot coke into the pre-chamber, the charging lid is opened. At this time, in a state where the atmosphere enters due to pressure balance, the forced blowing blower can be stopped.

In order to operate the waste heat boiler 7 efficiently, it is necessary to supply the gas 23 to the waste heat boiler 7 at a constant temperature and a constant flow rate. On the other hand, it is necessary to always blow a predetermined amount of air from the upper part of the pre-chamber as described above. Therefore, when the heat input from the red hot coke is sufficient, the temperature of the gas 22 discharged from the ring duct 5 may exceed the appropriate temperature to be supplied to the waste heat boiler 7.

In the present invention, a low-temperature inert gas is supplied to the line from the ring duct outlet to the primary dust catcher and mixed with the high-temperature gas discharged from the ring duct 5 to lower the gas temperature and reduce waste gas. The temperature of the hot boiler supply gas 23 can be maintained at a target temperature. It is preferable that a part of the low-temperature inert gas supplied from the circulation blower 8 to the cooling chamber 2 is branched by the branch pipe 19, and the branched low-temperature gas 29 is used as the low-temperature inert gas. The temperature of the waste heat boiler supply gas 23 can be adjusted by controlling the amount of the bypass gas. Since the flow rate of the inert gas 21 supplied to the cooling chamber 2 is reduced by an amount corresponding to the flow rate of the branched gas 29, the flow rate of the gas 23 supplied to the waste heat boiler can be kept constant.

The concept of gas temperature control will be described below.

The temperature of the red hot coke charged to the CDQ is 95
At 0 ° C., as the amount of air blown into the pre-chamber increases, as shown in FIG.
It rises with coke temperature. The amount of air blown into the pre-chamber is determined by the amount of fine coke adhering to the surface of the coke lump to be charged and the amount of volatile matter remaining in coke that changes depending on the quality of the dry distillation condition. The addition of water or steam to the pre-chamber lowers the temperature as shown by the dotted and dashed lines.

However, as described above, when there is a combustible gas component due to the water gas reaction in the pre-chamber or due to the remaining volatile matter in the coal, air is introduced into the ring duct or the duct toward the boiler. 25 (referred to as “ring duct blowing air” in this specification).

As a result, the temperature of the gas supplied to the boiler rises. To suppress this, the amount of the inert gas 29 blown is increased, so that the temperature can be controlled to be equal to or lower than the upper management limit temperature as shown in FIG. Become.

In addition to the amount of coke charged, the temperature of the boiler supply gas changes depending on the contents that cannot be easily measured in daily operation, such as temperature and residual volatile matter. It is effective to adjust the amount of air blown into the chamber and / or the amount of the inert gas 29. Although the outline is shown in FIG. 2 and FIG. 3, the method of adjusting the temperature of the gas supplied to the boiler by adjusting the amount of air blown into the pre-chamber is applicable even when water is not added to the pre-chamber.

When the amount of air blown into the ring duct is set to be constant, the temperature of the gas supplied to the boiler can be adjusted by increasing or decreasing the amount of inert gas blown, and furthermore, from the branch pipe 19 from the circulation blower outlet. When a gas is used, there is no need to consider the entire gas amount balance, so that there is an effect that the control becomes easy.

FIG. 3 shows a case where the amount of air blown into the pre-chamber is constant. However, the same adjustment can be made when the amount of air is changed.

[0037]

(Embodiment 1) The present invention was applied to a coke dry cooling apparatus shown in FIG. Cooling room 2 of dry cooling system
Is an internal volume of 600 m ³ , and the pre-chamber 3 is an internal volume of 300
m is ^3. The red hot coke 9 at a temperature of 980 ° C. is cooled at a capacity of 170 tons / H, and the temperature of the discharged coke 10 becomes 210 ° C. The temperature of the input red hot coke was measured by inserting a thermocouple into the coke in the bucket immediately before charging the coke dry cooling device. The thermocouple was inserted at substantially the center of the coke in the bucket (the center in the vertical, horizontal, and height directions).

Air 24 is blown from the upper part of the pre-chamber into a space 31 formed by the red hot coke upper surface 30 and the pre-chamber. The amount of air blown is 7000Nm ³ /
H. Further, water or steam 26 for adjusting the temperature in the pre-chamber is mixed with air 24 in the piping of the air blowing device 14, and the mixed gas is blown into the pre-chamber.

The temperature in the pre-chamber was experimentally measured by several methods. The first method is to insert a thermometer from the outside into the portion where the wall structure at the upper part of the pre-chamber is conical (18a). The second method is the inner cylinder brick that separates the inside of the pre-chamber part from the external ring duct. A third method is to insert a thermometer with a SUS protective tube from the outside to measure the ambient temperature at the lower part of the inner brick (18c). First
The method of (1) shows a slightly lower temperature, and the second and third methods show almost the same temperature. However, in this embodiment, the temperature by the third method is used as the pre-chamber internal temperature. The temperature increased from 1,050 ° C. before introducing air to 1,200 ° C. after the introduction of air started. On the other hand, water 0.3t /
h was blown into the air at a pressure of 0.5 kg / cm ² from a tube provided with a nozzle at the tip.
Has dropped.

In order to burn the combustible components in the exhaust gas 22 from the fire extinguisher and raise the temperature of the exhaust gas, air 25 was blown into the gas exhaust pipe 12 at 4000 nm ³ / h. The amount of recovered steam was usually 100 t / h, but it was 10
Increased to 5t / h. Further, water was added to the pre-chamber and the air was blown into the ring duct to increase to 108 t / h.

The appropriate flow rate of the gas supplied to the waste heat boiler 7 is 298000 Nm ³ / H, and the appropriate gas temperature is 980 ° C.
It rose above. In order to maintain the flow rate and the temperature at appropriate values, a part of the inert gas supplied from the circulation blower 8 to the cooling chamber 2 is branched to the branch pipe 19, and about 10,000 Nm ³ / h is discharged from the ring duct 5 to a high temperature. Mixed with gas. As a result, the temperature of the gas supplied to the boiler could be controlled to 980 ° C. or lower.

The air inside the pre-chamber was blown without air or water, and only air was blown into the pre-chamber.
Approximately 100
mm deposits. After cleaning these deposits once, water was blown in a mist and dispersed and injected into the air to keep the temperature inside the pre-chamber at 1150 ° C or less. As a result, good results were obtained even without long-term operation with no clinker attached. It became.

Example 2 Using the same equipment as in Example 1,
A test run was performed in which the boiler feed gas temperature was adjusted between 970 ° C and 980 ° C. For the amount of air blown into the pre-chamber (24), a flow meter was provided in the piping of the air blower 14. A flow meter was also installed on the ring duct blowing air pipe 15. Further, the inert gas 29 was supplied by gas from the branch pipe 19, but a flow meter was also installed in the middle of this pipe, and an adjusting valve capable of adjusting each flow rate, each flow rate, the temperature of the boiler supply gas, and the A computing device capable of calculating each flow rate by inputting hydrogen and carbon mon% and outputting an appropriate amount and an opening control device for each flow control valve are provided.

The operation of the coke oven on which the red hot coke was charged was largely fluctuated, and was unstable. The boiler had a steam production of 110t / h, while operating at around 90t / h.

Since the coke oven was insufficiently carbonized, a large amount of combustible gas components were contained in the coke mass to be charged. When air of 8000 Nm ³ / h was blown into the pre-chamber, the temperature of the gas supplied to the boiler was lowered. Begins to rise, and as the amount of hydrogen in the circulating gas component increases, the ring duct air 2
5 began to increase, and the brick temperature at the bottom of the pre-chamber rose to 1200 ° C. An arithmetic unit that detects this temperature and issues an instruction to increase the amount of the inert gas 29 operates to control the opening of the regulating valve provided in the middle of the branch pipe. This arithmetic unit was provided with a function of controlling the amount of air (24) blown into the pre-chamber and a function of controlling the amount of mist-like water blown into the pre-chamber.

As a result, during the period in which the charging of the red hot coke was stopped for about 10 minutes, adjustment was made to insert a large amount of air in order to stabilize the temperature of the gas supplied to the boiler, and the ring duct air 25 was also increased. Then red hot coke was injected, but when the pressure in the pre-chamber was negative,
Since the logic for reducing the volume of the pre-chamber air blowing (24) was included, a reduction instruction was output.

When the operation of the coke oven became stable and the injection of red-hot coke began to concentrate, the temperature of the gas supplied to the boiler began to rise. However, the amount of air blown into the pre-chamber was required to be continuously maintained in principle. For some reason, the temperature in the pre-chamber started to rise. Water spraying into the pre-chamber was started, and the value of the lower thermometer of the inner cylinder brick was 1
Although the temperature dropped to around 100 ° C., the amount of combustible gas in the circulating gas began to increase, so that the amount of ring duct air also started increasing by automatic control.

As a result, the temperature of the gas supplied to the boiler rises. At that time, the amount of the inert gas 29 starts to increase.
As a result, the temperature of the boiler feed gas could be stably maintained within the target temperature.

Also, as the amount of hydrogen in the circulating gas component increases, a method of setting the amount of the ring duct air 25 by a person has been implemented. However, it may be possible to make finer adjustments by automatically controlling the amount. understood.

[0050]

According to the present invention, by blowing water or steam together with air from the upper part of the pre-chamber of the coke dry-type fire extinguishing system, the temperature in the pre-chamber is maintained within an appropriate range to prevent the clinker from adhering to the system, and the waste heat boiler is used. It has become possible to secure the recovered heat.

[Brief description of the drawings]

FIG. 1 is a schematic view of a coke dry fire extinguishing apparatus of the present invention.

FIG. 2 is a diagram showing a relationship between a pre-chamber air introduction amount, a pre-chamber water addition amount, and a pre-chamber lower gas temperature.

FIG. 3 is a diagram showing a relationship between a ring duct blowing air amount, an inert gas addition amount, and a boiler supply gas temperature.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire tower 2 Cooling room 3 Pre-chamber 4 Sloping flue part 5 Ring duct 6 Primary dust catcher 7 Waste heat boiler 8 Circulation blower 9 Red hot coke 10 Exhaust coke 11 Inert gas blowing pipe 12 Gas exhaust pipe 13 Waste heat boiler gas supply Pipe 14 air blowing device 15 air blowing device 16 water or steam blowing device 17 blowing control device 18 pre-chamber temperature measuring device 19 branch pipe 20 inner cylinder 21 blowing inert gas 22 exhaust gas 23 waste heat boiler supply gas 24 pre-chamber blowing Air 25 Ring duct blowing air 26 Pre-chamber blowing water or steam 27 Inert gas flow 28 Air flow 29 Branch gas 30 Upper part of red hot coke layer 31 Space 32 Red hot coke layer 33 Dissipated gas 34 Water supply 35 Generated steam 36 secondary dust catcher

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Koichi Yamaguchi 1 Nishinosu, Oita-shi, Nippon Steel Corporation Inside Oita Works (72) Inventor Yuji Ishiharaguchi 1-1 Tobata-cho, Tobata-ku, Kitakyushu-shi Made in New Japan F-term in the Yawata Works (reference) 4H012 DA03 DA09 DA11

Claims (20)

[Claims] 1. A fire extinguisher tower comprising a cooling chamber and a pre-chamber above the cooling tower, and glowing coke is charged from above,
In a coke dry quenching method in which the sensible heat of the red hot coke is heat-exchanged in a cooling chamber using an inert gas as a medium and heat is recovered in the form of steam, air is blown into the pre-chamber from the upper part of the pre-chamber. A coke dry extinguishing method characterized by simultaneously blowing water or steam. 2. Adjusting one or both of the blowing amount of the water or steam and the blowing amount of the pre-chamber blowing air so that the temperature in the pre-chamber is equal to or higher than the temperature of the input red hot coke and equal to or lower than a predetermined temperature. The coke dry extinguishing method according to claim 1, wherein: 3. The coke dry-extinguishing method according to claim 2, wherein the predetermined temperature is 1150 ° C. 4. The high-temperature exhaust gas discharged from the fire extinguisher tower,
The coke dry-extinguishing method according to any one of claims 1 to 3, wherein air is supplied before reaching the waste heat boiler, and components in the exhaust gas are burned. 5. The high-temperature exhaust gas discharged from the fire extinguisher tower,
The method according to any one of claims 1 to 4, wherein a low-temperature inert gas is supplied before reaching the waste heat boiler, and the temperature of the waste heat boiler supply gas is reduced or adjusted to a predetermined temperature range. The described coke dry-extinguishing method. 6. The dry coke extinguishing method according to claim 5, wherein the low-temperature inert gas is a gas obtained by branching a part of an inert gas supplied to a cooling chamber. 7. Pre-chamber blowing air and / or
By adjusting the amount of water or steam to be added to the pre-chamber together with adjusting the amount of low-temperature inert gas to the high-temperature gas discharged from the cooling chamber and the pre-chamber before reaching the waste heat boiler, The coke dry fire extinguishing method according to claim 5 or 6, wherein the temperature of the boiler supply gas is adjusted to a target temperature range. 8. The water or steam blown into the pre-chamber is blown together with a nozzle of an air blower that blows into the pre-chamber.
A dry coke extinguishing method according to any one of claims 1 to 7. 9. The coke dry fire extinguishing method according to claim 1, wherein the water is blown into the pre-chamber in a mist state. 10. A fire extinguisher comprising a cooling chamber and a pre-chamber above the cooling tower. Red-hot coke is charged from above, and the sensible heat of the red-hot coke is exchanged in the cooling chamber with an inert gas as a medium. Then, in the coke dry fire extinguishing method in which heat is recovered in the form of steam, air is blown into the pre-chamber from above the pre-chamber,
A coke dry fire extinguishing method, characterized in that an amount of air blown into the pre-chamber is adjusted so that a temperature in the pre-chamber is 1150 ° C or less. 11. A cooling tower for exchanging sensible heat of red hot coke with an inert gas and a fire extinguishing tower comprising a pre-chamber above the cooling chamber, and a waste heat for recovering heat of the inert gas in the form of steam. A coke dry-type fire extinguisher comprising a boiler and a blower for blowing air into the pre-chamber and a blower for blowing water or steam into the pre-chamber. 12. The temperature in the pre-chamber is 115.
The coke dry fire extinguishing method according to claim 11, further comprising a blowing control device for adjusting one or both of the blowing amount of the water or steam and the blowing amount of the pre-chamber blown air so as to be 0 ° C or less. apparatus. 13. The high-temperature gas discharge path from the fire extinguisher tower to the waste heat boiler has an air blowing device for supplying air for burning components in the exhaust gas. A dry coke fire extinguisher according to item 1. 14. A high-temperature gas discharge path from a fire extinguisher to a waste heat boiler, wherein the temperature of the waste heat boiler supply gas is
The coke dry fire extinguisher according to any one of claims 11 to 13, further comprising an inert gas supply device that supplies a low-temperature inert gas for decreasing or adjusting the temperature to a predetermined temperature range. 15. The coke dry fire extinguisher according to claim 14, wherein the low-temperature inert gas supply device is a device for branching and supplying a part of the inert gas supplied to the cooling chamber. . 16. The pre-chamber blowing air and / or the amount of water or steam added to the pre-chamber, and the low temperature inert gas between the hot gas discharged from the cooling chamber and the pre-chamber to the waste heat boiler. The coke dry-type fire extinguisher according to claim 14 or 15, further comprising an arithmetic unit for adjusting the temperature of the gas supplied to the boiler to a target temperature range, provided with a device for adjusting the amount of gas supplied to the boiler. 17. The dry coke fire extinguisher according to claim 11, wherein a nozzle of the blowing device for blowing air into the pre-chamber also serves as a nozzle for blowing water or steam. 18. The dry coke fire extinguisher according to claim 11, wherein the blowing device for blowing water into the pre-chamber blows water in a mist state. 19. A cooling chamber for exchanging sensible heat of red-hot coke into an inert gas, a fire extinguishing tower comprising a pre-chamber above the cooling chamber, and a waste heat for recovering heat of the inert gas in the form of steam. A coke dry fire extinguisher having a boiler, wherein a blow device for blowing air into the pre-chamber is provided above the pre-chamber, and the pre-chamber blow air is blown so that the temperature in the pre-chamber is 1150 ° C or lower. A coke dry-type fire extinguisher characterized by having a blowing control device for adjusting a blowing amount of the coke. 20. The temperature measurement in the pre-chamber is performed by using a temperature measuring device that measures the ambient temperature or coke temperature of the lower part of the inner brick by a thermometer or a radiation thermometer inserted from the outside. Claims 12 to 19
A dry coke fire extinguisher according to any one of the above.